CN106787512B - A kind of accurate positioning method and device of the processing of permanent magnetism shaft - Google Patents
A kind of accurate positioning method and device of the processing of permanent magnetism shaft Download PDFInfo
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- CN106787512B CN106787512B CN201611215973.2A CN201611215973A CN106787512B CN 106787512 B CN106787512 B CN 106787512B CN 201611215973 A CN201611215973 A CN 201611215973A CN 106787512 B CN106787512 B CN 106787512B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
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- Iron Core Of Rotating Electric Machines (AREA)
Abstract
A kind of accurate positioning method of permanent magnetism shaft processing; p-m rotor includes permanent magnetism shaft, permanent magnet and iron core; permanent magnet and iron core are covered together in permanent magnetism shaft; magnetic field shielding device includes magnetic field shielding layer, shielded layer protective case and end cap; silicon steel lamella and end cap are passed through with screw rod; and tightened at the both ends of screw rod with fastening nut, so that magnetic field shielding device is tightened to an entirety；And band internal thread adjustment hole is opened in the radial direction in end cap, the adjustment hole will be passed through with externally threaded adjusting bolt, magnetic field shielding device is fixed on p-m rotor, and position and the angle in the axle center of magnetic field shielding device are adjusted by adjusting bolt, make the axle center of magnetic field shielding device and p-m rotor on the same line.The present invention can ensure that coaxial, the accurate positioning of magnetic field shielding device when realizing the processing of permanent magnetism axis of magnetic field shielding device and p-m rotor.
Description
Technical field
The present invention relates to the accurate positionings of magnetic field shielding device when a kind of processing of permanent magnetism shaft, and in particular to a kind of permanent magnetism turn
When axis is processed, method and apparatus that the position in the axle center of magnetic field shielding device can be adjusted.
Background technique
When lathe processes permanent magnetism shaft, the magnetic field that p-m rotor generates in order to prevent generates magnetic force, shadow to lathe
The machining accuracy for ringing lathe needs to cover upper magnetic field shielding device in p-m rotor periphery, to shield the magnetic field of p-m rotor generation.
To evade the unfavorable factor that the magnetic field of p-m rotor generation generates lathe and the damage metering of three coordinates.But magnetic field shielding device set
On p-m rotor, when with p-m rotor high-speed rotation, if the axle center in the axle center of magnetic field shielding device and p-m rotor
In the presence of deviate or magnetic field shielding device it is loosely organized, can make to cover magnetic field shielding device on p-m rotor and generate vibration.And
With the increase of the time of quickening and the rotation of the revolving speed of p-m rotor, this vibration can be more violent, or even can make magnetic field screen
It covers device to detach from p-m rotor, causes mechanical damage, seriously affect the processing of permanent magnetism shaft.
Find that following patent and the present invention have similarity by country's retrieval:
Application No. is CN200910307824.2, the disclosure of the invention of entitled " grinding jig for guaranteeing high-precision concentricity "
A kind of grinding jig guaranteeing high-precision concentricity.The present invention constitutes the clamp body (2) including tubular, is equipped in clamp body (2)
Positioning table (3), positioning table (3) abut the face positioning datum T of part, realize the face the T positioning of part；The side of positioning table (3) is set
It is equipped with orientation block (4), orientation block (4) abuts the positioning datum R arc of part (1) side, realizes the side positioning of part (1)；Folder
It is specifically additionally provided with fixation kit (5) in (2), positioning table (3) and part (1) are connected and fixed by fixation kit (5), realize part
(1) fix to clamp.Simple but very compact, ingenious, easy to manufacture, easy to operate, the reliable clamping of positioning of the invention structure, processing
Precision is high, at low cost, and balance is good when adjustment rotates, and meets processing request, it is ensured that processing quality ensure that production needs
It wants, improves production efficiency.
Although above-mentioned patent requirements protection is also a kind of device for requiring high-precision concentricity, no public affairs in this patent
The magnetic field shielding device being made from multiple components is opened, also fails to disclose how to allow and protect between multiple components in magnetic field shielding device
It holds concentricity and magnetic field shielding device and p-m rotor keeps the method and structure of concentricity.Therefore, in structure and realization
It is very different in the technical solution of concentricity with the present invention.
Summary of the invention
The technical problem to be solved by the present invention is the magnetic field shielding device being added on p-m rotor how to be allowed to turn with permanent magnetism
When son rotates together, the concentricity in the axle center of magnetic field shielding device and p-m rotor can be improved, reduces the vibration of magnetic field shielding device
It is dynamic, the processing of permanent magnetism shaft can be gone on smoothly.
With the above problem, technical solution proposed by the present invention is needle: a kind of accurate positioning method of permanent magnetism shaft processing, forever
Magnet rotor includes permanent magnetism shaft, permanent magnet and iron core, and permanent magnet and iron core are covered together in permanent magnetism shaft, magnetic field shielding device packet
Magnetic field shielding layer, shielded layer protective case and end cap are included, passes through silicon steel lamella and end cap with screw rod, and fasten at the both ends of screw rod
Nut is tightened, so that magnetic field shielding device is tightened to an entirety；And band internal thread is opened in the radial direction in end cap
Adjustment hole will pass through the adjustment hole with externally threaded adjusting bolt, magnetic field shielding device be fixed on p-m rotor,
And position and the angle in the axle center of magnetic field shielding device are adjusted by adjusting bolt, make magnetic field shielding device and p-m rotor
Axle center is on the same line.
Further, magnetic field shielding layer includes silicon steel lamella, shielding cylinder and screw rod, and shielded layer protective case is matched by interference
The inside for being mounted on silicon steel lamella is closed, shielded layer protective case is compressed the radially inside direction of silicon steel lamella, thus
Allow in silicon steel lamella per a piece of silicon steel sheet and the axle center of shielded layer protective case is all on same straight line.
Further, shielding cylinder is covered on silicon steel lamella, makes to be adjacent on the outside of the inside of shielding cylinder and silicon steel lamella, from
And allow in silicon steel lamella per a piece of silicon steel sheet and the axle center of shielding cylinder is all on same straight line.
Further, end cap includes left end cap and right end cap, and the mounting hole of 2 rows or more, mounting hole are opened on silicon steel lamella
It is evenly distributed in silicon steel lamella；And corresponding mounting hole is opened on end cap, it is passed through on silicon steel lamella and end cap with screw rod
Shielding cylinder and shielded layer protective case are mounted between left end cap and right end cap by mounting hole, make shielding cylinder, silicon steel lamella, shielding
Layer protective case, screw rod, left end cap and right end cap axle center all on same straight line.
Further, the fastening nut at screw rod both ends is tightened, makes shielding cylinder, silicon steel lamella and shielded layer protective case can
It is fixed on magnetic field shielding device that an entirety is formed between left end cap and right end cap, firm, concentric.
Further, comprising the following steps:
A., screw rod is passed through to one in left end cap or right end cap, and screws on fastening nut in one end of screw rod；
B. shielding cylinder is fixed on above-mentioned end cap；
C. by silicon steel sheet in layer pass through screw rod, form the lamination of silicon steel sheet；
D., 1 shielded layer protective case is mounted on to the inside of the lamination of above-mentioned silicon steel sheet by interference fit；
E. step C and D is repeated in until silicon steel sheet and shielded layer protective case are all superimposed completion；
F. another in left end cap or right end cap is covered, and the fastening nut at screw rod both ends is all tightened.
A kind of accurate positioning device of permanent magnetism shaft processing, p-m rotor includes permanent magnetism shaft, permanent magnet and iron core, permanent magnetism
Body and iron core are covered together in permanent magnetism shaft, which is characterized in that magnetic field shielding device includes magnetic field shielding layer, shielded layer protective case
And end cap, magnetic field shielding device cover on p-m rotor, adjustment hole are radially provided on end cap, being equipped in adjustment hole can adjust
The shaft core position of whole magnetic field shielding device and the adjusting bolt of angle.
Further, magnetic field shielding layer includes silicon steel lamella, shielding cylinder and screw rod, and end cap includes left end cap and right end cap；
Perforative mounting hole is all provided on silicon steel lamella, left end cap and right end cap, screw rod passes through the mounting hole for silicon steel lamella, a left side
End cap and right end cap connect into an entirety.
Further, shielded layer protective case is circular tube shaped, and shielded layer protective case is mounted on silicon steel lamella by interference fit
Inside.
Further, shielding cylinder is open circles tubulose, is adjacent on the outside of the inside of shielding cylinder and silicon steel lamella.
The invention has the advantages that
1. enabling shielded layer protective case will be in silicon steel lamella for the inside of silicon steel lamella is mounted on by interference fit
Lateral edge radial direction compresses, and silicon steel lamella and shielded layer protective case can be made coaxial.
2. covering shielding cylinder on silicon steel lamella, makes to be adjacent on the outside of the inside of shielding cylinder and silicon steel lamella, silicon steel can be made
Lamella and shielding cylinder set are coaxial.
3. passing through silicon steel lamella and end cap with screw rod, shielding cylinder and shielded layer protective case are all mounted on left end cap and right end
It between lid, and is tightened at the both ends of screw rod with fastening nut, can allow the compact-sized, firm of entire magnetic field shielding device, so that
When rotating together with p-m rotor, all parts in magnetic field shielding device will not scatter magnetic field shielding device.
4. two or more screw rods are evenly distributed in silicon steel lamella, can allow more screw rods axle center and silicon steel lamella,
Shielding cylinder, shielded layer protective case, left end cap and right end cap axle center on the same line, it is each in magnetic field shielding device to ensure
A component is all coaxial.
5. all parts in magnetic field shielding device are installed, after fastening well, from the adjustment hole in the radial direction of end cap
Place loads onto adjusting bolt, will adjust bolt fastening on p-m rotor, and can install magnetic field shielding device, be fixed on permanent magnetism turn
On son.
6. adjusting after bolt passes through end cap and having one section of inside for stretching out end cap, it is long to regulate each stretching for adjusting bolt
Degree, can allow entire magnetic field shielding device axle center position and angle all with the position in the axle center of p-m rotor and angle phase
Together, it is ensured that coaxial, the accurate positioning of magnetic field shielding device when realizing the processing of permanent magnetism axis of magnetic field shielding device and p-m rotor.
7. due to adjust bolt and adjustment hole be by being threadedly engaged, even if adjust the head of bolt not with
End cap contact can allow magnetic field shielding device to fix as long as each other end for adjusting bolt is fixed on p-m rotor
On p-m rotor, and magnetic field shielding device cannot be moved along the screw rod direction for adjusting bolt.
Detailed description of the invention
Fig. 1 is schematic cross-sectional view of the invention；
Fig. 2 is the partial enlarged view of a-quadrant in Fig. 1；
Fig. 3 is the schematic cross-sectional view of magnetic field shielding device in the present invention；
Fig. 4 is the schematic cross-sectional view of p-m rotor in the present invention；
Fig. 5 is the cross-sectional view of A-A in Fig. 4；
Fig. 6 is the partial schematic of permanent magnet-shield；
Fig. 7 is the partial exploded view of magnetic field shielding device；
Fig. 8 is the partial sectional view of end cap；
In figure: 1 p-m rotor, 11 permanent magnetism shafts, 12 permanent magnets, 13 iron cores, 2 magnetic field shielding devices, the protection of 21 shielded layers
Set, 22 silicon steel lamellas, 23 shielding cylinders, 24 gaps, 25 screw rods, 26 left end caps, 27 right end caps, 271 adjustment holes, 28 fastening nuts,
29 adjust bolt.
Specific embodiment
The description of a step is done to the present invention below with reference to embodiment and attached drawing:
Embodiment one
As shown in Fig. 1, Fig. 3, Fig. 4 and Fig. 7, magnetic field shielding device 2 is covered on p-m rotor 1, in p-m rotor 1
The magnetic field that permanent magnet 12 generates is shielded.Wherein p-m rotor 1 includes: permanent magnetism shaft 11, permanent magnet 12 and iron core 13.And magnetic
Field screening arrangement 2 includes: magnetic field shielding layer, shielded layer protective case 21 and end cap, wherein magnetic field shielding layer includes: silicon steel lamella
22, shielding cylinder 23 and screw rod 25；End cap includes: left end cap 26 and right end cap 27.Left end cap 26 and right end cap 27 are arranged forever
On the axial direction of magnetic shaft 11, and shielding cylinder 23, silicon steel lamella 22 and shielded layer protective case 21 are to be arranged in from outside to inside forever
In the circumferential direction of magnetic shaft 11.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 7 and Fig. 8, magnetic field shielding device 2 is installed to realization magnetic field screen on p-m rotor 1
The step of covering is: being all provided with mounting hole on left end cap 26 and right end cap 27, screw rod 25 first can be passed through left end cap 26 or right end cap
One in 27, for example, passing through right end cap 27.It is polished rod since screw rod 25 is intermediate, both ends are equipped with externally threaded rhabodoid.Cause
This, screw rod 25 passes through right end cap 27, and fastening nut 28 is screwed in the one end for stretching out right end cap 27, can prevent from being screwed with fastening nut
It is extracted out from right end cap 27 28 one end.
Then shielding cylinder 23 is fixed on right end cap 27, then the silicon steel sheet for being provided with mounting hole is passed through screw rod from level to level
25, when silicon steel sheet stack is added to the thickness with the similar length of a shielded layer protective case 21, shielded layer protective case 21 was passed through
Cooperation of being full of is assembled.Then what is repeated passes through silicon steel sheet screw rod 25 from level to level, then assembles the protection of another shielded layer again
Set 21, until the thickness of silicon steel sheet and the length of shielded layer protective case 21 reach required requirement.Shielded layer protective case in Fig. 7
21 and silicon steel lamella 22, all only a part of entire shielded layer protective case 21 and entire silicon steel lamella 22.
Shielded layer protective case 21 is divided into it is multiple, by silicon steel sheet and shielded layer protective case 21 be divided into repeatedly carry out repeat assembly
It is the difficulty in order to reduce installation.Because in order to allow the discharge that silicon steel sheet can be neat in magnetic field shielding device 2, shielded layer is protected
Sheath 21 is to carry out interference fit with silicon steel sheet to be installed, it is therefore desirable to the power of biggish extruding.If shielded layer protected
Sheath 21 is fabricated to an entirety, disposable to install, and installation can be made to become very time-consuming, laborious.
Left end cap 26 is finally covered again, and the fastening nut 28 at 25 both ends of screw rod is all tightened, so that silicon steel lamella 22 be pressed
Tightly.It is coaxial in order to ensure magnetic field shielding device 2 and p-m rotor 1, it is provided in the radial direction of left end cap 26 and right end cap 27
Tapped adjustment hole 271.With externally threaded adjusting bolt 29 by being threadedly engaged across adjustment hole 271, bolt will be adjusted
29 are fixed on p-m rotor 1, so that magnetic field shielding device 2 is fixed on p-m rotor 1, make magnetic field shielding device 2 and forever
Magnet rotor 1 rotates together.
The mounting hole for the perforation opened on left end cap 26, right end cap 27 and silicon steel lamella 22 is formd in magnetic field shielding device 2
Several rows of mounting hole.In order to which silicon steel lamella 22 can be more stably mounted in magnetic field shielding device 2, the row of the mounting hole
Number is 2 rows or more, and is all passed through with a screw rod 25 in every row's mounting hole.
In order to preferably adjust the concentricity of magnetic field shielding device 2 and p-m rotor 1, opened on left end cap 26 and right end cap 27
The number of adjustment hole 271 be preferably 3 or more.After each adjusting bolt 29 on end cap touches p-m rotor 1, pass through
Adjustment adjusts the length that bolt 29 stretches out adjustment hole 271, is just adjustable position and the angle in the axle center of magnetic field shielding device, it is ensured that
The concentricity of magnetic field shielding device 2 and p-m rotor 1.Wherein, the screw rod 25 in silicon steel lamella 22 and the adjusting in end cap
Bolt 29 is all equally distributed.
As shown in Figure 4 and Figure 5, when being fitted without magnetic field shielding device 2 on p-m rotor 1, lathe is to permanent magnetism shaft 11
Both ends when carrying out grinding, the magnetic field that can be generated on the permanent magnet 12 in p-m rotor 1, so that magnetic can be generated to lathe
Power.Especially in the circumferential direction of permanent magnetism shaft 11, p-m rotor 1 can generate biggish magnetic force to lathe, will affect lathe
The precision of grinding and the quality of processing are carried out to permanent magnetism shaft 11.
As shown in figs. 1,2 and 6, in order to which the magnetic field for evading the generation of p-m rotor 1 produces lathe and the damage metering of three coordinates
Raw unfavorable factor.Magnetic field shielding device 2 is installed on p-m rotor 1, to the magnetic generated on the permanent magnet 12 in p-m rotor 1
Field is shielded.Particularly, it is the silicon steel lamella 22 on the outer sheath of p-m rotor 1, and turns silicon steel lamella 22 and permanent magnetism
There are gap 24 between son 1, allow the magnetic induction line that is issued from p-m rotor 1 p-m rotor 1, gap 24 and silicon steel lamella 22 it
Between form closed circuit, to be shielded to the magnetic field issued in p-m rotor 1.And the shielding cylinder 23 in 22 outside of silicon steel lamella
It is further to be shielded to leakage field.
As shown in Fig. 1, Fig. 3, Fig. 7 and Fig. 8, in order to ensure in silicon steel lamella 22 per a piece of silicon steel sheet and shielded layer is protected
The axle center of sheath 21 is that shielded layer protective case 21 is mounted on silicon steel lamella 22 by interference fit all on same straight line
Inside enables shielded layer protective case 21 to compress the radially inside direction of silicon steel lamella 22 to realize.
In order to ensure the often axle center of a piece of silicon steel sheet and shielding cylinder 23 in silicon steel lamella 22 is all on same straight line,
It is by 23 sets of shielding cylinder on silicon steel lamella 22, the outside of the inside and silicon steel lamella 22 that make shielding cylinder 23 is adjacent to realize.
In order to ensure all parts in entire magnetic field shielding device 2 have the structure of good concentricity and fastening, it is
Silicon steel lamella 22 and end cap are passed through with screw rod 25, and is tightened in the both ends fastening nut 28 of screw rod 25, thus by magnetic field shielding
Device 2 is tightened to an entirety；And band internal thread adjustment hole 271 is opened in the radial direction in end cap, external screw thread will be had
Adjusting bolt 29 pass through the adjustment hole 271, magnetic field shielding device 2 is fixed on p-m rotor 1, and by adjust spiral shell
Bolt 29 adjusts position and the angle in the axle center of magnetic field shielding device 2.
It will be apparent that without departing from the principles of the present invention, several improvement or modification made are regarded as this
The protection scope of invention.
Claims (7)
1. a kind of accurate positioning method of permanent magnetism shaft processing, p-m rotor (1) include permanent magnetism shaft (11), permanent magnet (12) and
Iron core (13), permanent magnet (12) and iron core (13) are covered together on permanent magnetism shaft (11), which is characterized in that magnetic field shielding device
(2) include magnetic field shielding layer, shielded layer protective case (21) and end cap, pass through silicon steel lamella (22) and end cap with screw rod (25), and
It is tightened at the both ends of screw rod (25) with fastening nut (28), so that magnetic field shielding device (2) is tightened to an entirety；And it is holding
Lid opens band internal thread adjustment hole (271) in the radial direction, will pass through with externally threaded adjusting bolt (29) described
Magnetic field shielding device (2) is fixed on p-m rotor (1) by adjustment hole (271), and adjusts magnetic field by adjusting bolt (29)
The position in the axle center of screening arrangement (2) and angle make the axle center of magnetic field shielding device (2) and p-m rotor (1) in same straight line
On；Magnetic field shielding layer includes silicon steel lamella (22), shielding cylinder (23) and screw rod (25), and shielded layer protective case (21) is passed through interference
It is fitted to the inside of silicon steel lamella (22), so that shielded layer protective case (21) can be by silicon steel lamella (22) radially inside
Direction compresses, thus allow in silicon steel lamella (22) per a piece of silicon steel sheet and the axle center of shielded layer protective case (21) is all same
On straight line；Shielding cylinder (23) is covered on silicon steel lamella (22), make shielding cylinder (23) inside and silicon steel lamella (22) it is outer
Side is adjacent to, thus allow in silicon steel lamella (22) per a piece of silicon steel sheet and the axle center of shielding cylinder (23) is all in same straight line
On；End cap includes left end cap (26) and right end cap (27), and the mounting hole of 2 rows or more, and mounting hole are opened on silicon steel lamella (22)
It is evenly distributed in silicon steel lamella (22)；And corresponding mounting hole is opened on end cap, silicon steel lamella is passed through with screw rod (25)
(22) shielding cylinder (23) and shielded layer protective case (21) are mounted on left end cap (26) and right end cap by the mounting hole and on end cap
(27) between, make shielding cylinder (23), silicon steel lamella (22), shielded layer protective case (21), screw rod (25), left end cap (26) and right end
The axle center of (27) is covered all on same straight line.
2. a kind of accurate positioning method of permanent magnetism shaft processing according to claim 1, which is characterized in that by screw rod (25)
The fastening nut (28) at both ends is tightened, and be fixed on shielding cylinder (23), silicon steel lamella (22) and shielded layer protective case (21) can
An entirety, firm, concentric magnetic field shielding device (2) is formed between left end cap (26) and right end cap (27).
3. a kind of accurate positioning method of permanent magnetism shaft processing according to claim 1 or 2, which is characterized in that including with
Lower step:
A., screw rod (25) are passed through to one in left end cap (26) or right end cap (27), and screw on fastening in one end of screw rod (25)
Nut (28)；
B. shielding cylinder (23) is fixed on above-mentioned end cap；
C. by silicon steel sheet in layer pass through screw rod (25), form the lamination of silicon steel sheet；
D., 1 shielded layer protective case (21) is mounted on to the inside of the lamination of above-mentioned silicon steel sheet by interference fit；
E. step C and D is repeated in until silicon steel sheet and shielded layer protective case (21) are all superimposed completion；
F. another in left end cap (26) or right end cap (27) is covered, and the fastening nut (28) at screw rod (25) both ends is all twisted
Tightly.
4. a kind of accurate positioning device of permanent magnetism shaft processing, p-m rotor (1) include permanent magnetism shaft (11), permanent magnet (12) and
Iron core (13), permanent magnet (12) and iron core (13) are covered together on permanent magnetism shaft (11), which is characterized in that magnetic field shielding device
It (2) include magnetic field shielding layer, shielded layer protective case (21) and end cap, magnetic field shielding device (2) covers on p-m rotor (1), end
It covers and is radially provided with adjustment hole (271), the axle center position that can adjust magnetic field shielding device (2) is equipped in adjustment hole (271)
Set the adjusting bolt (29) with angle.
5. a kind of accurate positioning device of permanent magnetism shaft processing according to claim 4, which is characterized in that magnetic field shielding layer
Including silicon steel lamella (22), shielding cylinder (23) and screw rod (25), end cap includes left end cap (26) and right end cap (27)；Silicon steel lamella
(22), it is all provided with perforative mounting hole on left end cap (26) and right end cap (27), screw rod (25) passes through the mounting hole for silicon
Steel disc layer (22), left end cap (26) and right end cap (27) connect into an entirety.
6. a kind of accurate positioning device of permanent magnetism shaft processing according to claim 5, which is characterized in that shielded layer protection
Covering (21) is circular tube shaped, and shielded layer protective case (21) is mounted on the inside of silicon steel lamella (22) by interference fit.
7. a kind of accurate positioning device of permanent magnetism shaft processing according to claim 6, which is characterized in that shielding cylinder (23)
For open circles tubulose, it is adjacent on the outside of the inside and silicon steel lamella (22) of shielding cylinder (23).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611215973.2A CN106787512B (en) | 2016-12-26 | 2016-12-26 | A kind of accurate positioning method and device of the processing of permanent magnetism shaft |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611215973.2A CN106787512B (en) | 2016-12-26 | 2016-12-26 | A kind of accurate positioning method and device of the processing of permanent magnetism shaft |
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| CN106787512B true CN106787512B (en) | 2019-01-29 |
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| CN113153175B (en) * | 2021-03-18 | 2022-04-01 | 江苏和信石油机械有限公司 | Horizontal directional drilling machine |
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| CN102969812A (en) * | 2012-12-14 | 2013-03-13 | 哈尔滨工业大学 | Modulation ring rotor based on magnetic shielding principle |
| JP2015186327A (en) * | 2014-03-24 | 2015-10-22 | セイコーエプソン株式会社 | Motor, manufacturing method of the same, and robot |
| CN206498300U (en) * | 2016-12-26 | 2017-09-15 | 株洲九方装备股份有限公司 | A kind of accurate positioning device of permanent magnetism rotating shaft processing |
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